Captain America: The First Avenger (2011)

Set during World War II, "Captain America: The First Avenger" follows the journey of Steve Rogers, a frail young man determined to serve his country. After being rejected for military service, he volunteers for a top-secret experiment that transforms him into the super-soldier Captain America. Armed with enhanced strength and agility, Steve battles the Red Skull, leader of the villainous Hydra organization, who seeks to harness the power of the Tesseract. The film explores themes of courage, sacrifice, and patriotism, showcasing Rogers' transformation into a symbol of hope and resilience, paving the way for his future role in the Avengers.